/* Chapter 7 Excercise 8: Extract variables from string */

void setup() {
   char message[] = "70.0,95,15:00";
 
   int index;
   int holdIndex = 0;
   int temperature;
   int humidity;

   Serial.begin(9600);
   
   index = FindCharacter(message, ',');
   if (index > 0) {                 // Found a comma
      message[index] = '\0';        // Make it a string
      temperature = atoi(message);
      holdIndex += index + 1;       // Look past the null for next pass
   }
   index = FindCharacter(message + holdIndex, ','); // Really passing message[5]
   if (index > 0) {             // Found a comma
      message[index] = '\0';    // Make it a string
      humidity = atoi(&message[holdIndex]);
      holdIndex += index + 1;
   }
   Serial.print("The temperature is = ");
   Serial.print(temperature);
   Serial.print(" with humidity = ");
   Serial.print(humidity);
   Serial.print(" at ");
   Serial.print(&message[holdIndex]);
}
void loop(){}

/*****
  This method looks for a specific character in a string
  
  Parameter list:
    char msg[]    an array of characters, null terminated
    char c        the char to find
    
  return value:
    int           the position in the string where found or 
                  0 if no match
*****/
int FindCharacter(char msg[], char c)
{
  int i = 0;
  
  while (msg) {
    if (msg[i] == c) {
       return i;
    } else {
      i++;
    }
  }
  return 0;
}